8. (05.06 LC) What is the graph of the function f(x) = -X² + x + 20 ? (6 points) X + 4 у 8 7 5 3 (-4, 1 2. Х -9-8-7-7-5-4-3-2-1 1 2 3 4 -3 HY

Ur environment is very sensitive to the amount of ozone in the upper atmosphere. the level of ozone normally found is 4.04.0 parts/million (ppm). a researcher believes that the current ozone level is not at a normal level. the mean of 2525 samples is 4.44.4 ppm with a standard deviation of 0.80.8. assume the population is normally distributed. a level of significance of 0.020.02 will be used. make the decision to reject or fail to reject the null hypothesis. answer tables